Ideally, only the variable of interest (the color pattern of the artificial snakes) differs between the control and experimental groups

A controlled experiment means that control groups are used to cancel the effects of unwanted variables

A controlled experiment does not mean that all unwanted variables are kept constantDesigning Controlled ExperimentsResults must be observable and repeatableIdeas can never be proven, only disproved.Supernatural explanations are outside the realm of science.Ideas that have been tested repeatedly. Can be used to make accurate predictions.Models allow us to test ideas.Kingdom AnimaliaKingdomPlantaeKingdom FungiProtists(c) DOMAIN EUKARYA(b) DOMAIN ARCHAEA(a) DOMAIN BACTERIAThe Three Domains of LifeThe question of the red panda.Cactus-flower-eatersSeed-eatersGround finchesLarge ground finchGeospiza magnirostrisMedium ground finchGeospiza fortisSmall ground finchGeospiza fuliginosaCactus ground finchGeospiza scandensLarge cactusground finchGeospiza conirostrisSmall tree finch Camarhynchus parvulusLarge tree finch Camarhynchus psittaculaMedium tree finch Camarhynchus pauperWoodpecker finch Cactospiza pallidaMangrove finch Cactospiza heliobatesVegetarian finch Platyspiza crassirostrisSharp-beakedground finch Geospiza difficilisGray warbler finch Certhidea fuscaGreen warbler finch Certhidea olivaceaTree finchesInsect-eatersBud-eaterSeed-eaterInsect-eatersWarbler finchesCOMMONANCESTORCross section of a cilium, as viewedwith an electron microscopeCilia ofwindpipecellsCilia ofParameciumBiology!Chapter 1Any Questions?A. Cells in the intestinal lining of vertebrates have many small projections that increase the surface area for absorption of nutrients.B. Plants that live in dry areas have large roots for absorbing water.C. Seeds that are dispersed by wind are very light.D. Fish that swim rapidly have bodies that are streamlined.E. Moles have large front paws for digging.

Form and FunctionThe idea that form and function are related would not be exemplified by which of the following examples? A. As carbon dioxide levels rise in the blood of a mammal, the rate of breathing increases, leading to a decrease in blood levels of carbon dioxide.B. As global temperatures rise, more ice melts, leading to greater planetary absorption of sunlight and additional temperature increase.C. The speed of a racehorse decreases after running a mile.D. The metabolic rate and energy consumption of grizzly bears decreases during hibernation.E. Frog eggs hatch after five days of development at 28 degrees C but after 10 days of development at 23 degrees C.